insistent
adj.adj. demanding something firmly and refusing to take 'no' for an answer. You use this to describe someone who keeps asking for something or a sound that will not stop.
adj. demanding something firmly or persistently; refusing to allow any alternative. Often describes a person's manner or a repetitive, unavoidable sound.
She was insistent that we leave the party immediately.
Despite my repeated excuses, the salesman was insistent that I try the new software for a week.
The insistent ringing of the telephone eventually broke through his deep sleep, forcing him to answer the call despite the late hour.
From Latin insistens, participle of insisto.
Often followed by the preposition 'on' or a 'that' clause.
He was insistent to pay the billHe was insistent on paying the billInsistent is followed by the preposition 'on' and a gerund, not a 'to' infinitive.